Why isn't shit installing on my macbook? ANGER!

[Sexy_Potatoe_with_an_E]

I saw that there was only 8 gigs of space left on my mabook. So I decided to delete safari because I had installed firefox. But I noticed the katg chat wasn't working on firefox WTF is up with that btw? And it has nothing to do wth java cause all of that shit is enabled. Well the chat works on safari so I tried to download safari again. But it won't install, it says I need 30mb of free space on my hard drive, but I have 20gigs. Then I tried to install VLC and it says the program has successfully been installed but when I try to open it no go. ANGRY FUMING POTATOE HELP!